here is a nested test
\begin{one}[optional argument]
	to be nested to be nested
	to be nested to be nested
	to be nested to be nested
	\begin{two}
		\[ x^2\]
		nested text nested tex nested tex [not an argument]
		nested text nested tex nested tex
		nested text nested tex nested tex
		nested text nested tex nested tex
	\end{two}
\end{one}
